11.1 Describing Chemical Reactions - Weeblynkscience.weebly.com/uploads/8/7/1/4/8714635/chapter11_section01... · Title: chapter11_section01_edit.ppt Author: Nicolette Kimball Created

1

Slide 1 of 37

chemistry

© Copyright Pearson Prentice Hall

Slide 2 of 37

Describing Chemical Reactions

On May 6, 1937, the huge airship Hindenburg erupted into a fireball. Within a short time, 210,000 cubic meters of hydrogen had burned and the airship was destroyed. The chemical reaction that occurred is “hydrogen combines with oxygen to produce water.” You will learn to represent this chemical reaction by a chemical equation.

11.1

2



>

Slide 3 of 37

Writing Chemical Equations


How do you write a word equation?

11.1

Slide 4 of 37



> Writing Chemical Equations

Word Equations

To write a word equation, write the names of the reactants to the left of the arrow separated by plus signs; write the names of the products to the right of the arrow, also separated by plus signs.

Reactant + Reactant Product + Product

11.1

3

Slide 5 of 37




Methane + Oxygen Carbon dioxide + Water

11.1

Slide 6 of 37




iron + oxygen → iron(III) oxide

11.1

4

Slide 7 of 37




Hydrogen Peroxide Water and Oxygen

11.1

Slide 8 of 37




Chemical Equations

A chemical equation is a representation of a chemical reaction; the formulas of the reactants (on the left) are connected by an arrow with the formulas of the products (on the right).

11.1

5



>

Slide 9 of 37


How do you write a skeleton equation?

11.1

Slide 10 of 37




Write the formulas of the reactants to the left of the yields sign (arrow) and the formulas of the products to the right.

11.1

6

Slide 11 of 37




A skeleton equation is a chemical equation that does not indicate the relative amounts of the reactants and products.

Here is the equation for rusting:

Fe + O2 Fe2O3

11.1

Slide 12 of 37




A catalyst is a substance that speeds up the reaction but is not used up in the reaction.

Without Catalyst With Catalyst

11.1

7

Slide 13 of 37



> Writing Chemical Equations 11.1


Slide 14 of 37



Animation 12

Relate chemical symbols and formulas to the information they communicate.

8


Slide 15 of 37


Slide 16 of 37

9


Slide 17 of 37


Slide 18 of 37

Practice Problems for Conceptual Problem 11.1

Problem Solving 11.2 Solve Problem 2 with the help of an interactive guided tutorial.

10



>

Slide 19 of 37

Balancing Chemical Equations

Balancing Chemical Equations

What are the steps in writing a balanced chemical equation?

11.1


Slide 20 of 37


> Balancing Chemical Equations

To write a balanced chemical equation, first write the skeleton equation. Then use coefficients to balance the equation so that it obeys the law of conservation of mass.

11.1

11

Slide 21 of 37




This is a balanced equation for making a bicycle. The numbers are called coefficients—small whole numbers that are placed in front of the formulas in an equation in order to balance it.

11.1

Slide 22 of 37




A chemical reaction is also described by a balanced equation in which each side of the equation has the same number of atoms of each element and mass is conserved.

11.1

12


Slide 23 of 37



Simulation 11

Sharpen your skills by balancing chemical equations.


Slide 24 of 37

13


Slide 25 of 37


Slide 26 of 37

14


Slide 27 of 37


Slide 28 of 37

Practice Problems for Conceptual Problem 11.2

Problem Solving 11.4 Solve Problem 4 with the help of an interactive guided tutorial.

15


Slide 29 of 37


Slide 30 of 37

16


Slide 31 of 37


Slide 32 of 37

Documents

11.1 Describing Chemical Reactions - Weeblynkscience.weebly.com/uploads/8/7/1/4/8714635/chapter11_section01... · Title: chapter11_section01_edit.ppt Author: Nicolette Kimball Created